package com.atguigu.flink.chapter11;

import com.atguigu.flink.bean.WaterSensor;
import org.apache.flink.api.common.eventtime.WatermarkStrategy;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.streaming.api.datastream.DataStream;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.table.api.*;
import org.apache.flink.table.api.bridge.java.StreamTableEnvironment;

import java.time.Duration;

import static org.apache.flink.table.api.Expressions.$;
import static org.apache.flink.table.api.Expressions.lit;

/**
 * @Author lizhenchao@atguigu.cn
 * @Date 2021/12/21 10:04
 */
public class Flink10_Window_Grouped {
    public static void main(String[] args) {
        Configuration conf = new Configuration();
        conf.setInteger("rest.port", 20000);
        StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment(conf);
        env.setParallelism(1);
        
        DataStream<WaterSensor> waterSensorStream =
            env
                .fromElements(new WaterSensor("sensor_1", 1001L, 10),
                              new WaterSensor("sensor_1", 2000L, 20),
                              new WaterSensor("sensor_1", 4001L, 40),
                              new WaterSensor("sensor_1", 5000L, 50),
                              new WaterSensor("sensor_2", 3000L, 30),
                              new WaterSensor("sensor_2", 6000L, 60))
                .assignTimestampsAndWatermarks(
                    WatermarkStrategy
                        .<WaterSensor>forBoundedOutOfOrderness(Duration.ofSeconds(3))
                        .withTimestampAssigner((ws, ts) -> ws.getTs())
                );
        
        StreamTableEnvironment tEnv = StreamTableEnvironment.create(env);
        
        // 每隔5s统计最近5s内每个传感器的水位和
        Table table = tEnv.fromDataStream(waterSensorStream, $("id"), $("ts").rowtime(), $("vc"));
    
        // 创建一个滚动窗口
//        GroupWindow w = Tumble.over(Expressions.lit(5).second()).on($("ts")).as("w");
//        GroupWindow w = Slide.over(lit(5).second()).every(lit(2).second()).on($("ts")).as("w");
        GroupWindow w = Session.withGap(lit(2).second()).on($("ts")).as("w");
        table
            .window(w)
            .groupBy($("id"), $("w"))
            .select($("id"), $("w").start().as("stt"), $("w").end().as("edt"), $("vc").sum().as("vc_sum"))
            .execute()
            .print();
        
    
    }
}
